Render the search UI on a separate row from the breadcrumbs

- In project search, render it above the breadcrumbs
- In buffer search, render it below

Co-Authored-By: Antonio Scandurra <me@as-cii.com>
Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/workspace/src/workspace.rs

@@ -48,7 +48,7 @@ use std::{
     },
 };
 use theme::{Theme, ThemeRegistry};
-pub use toolbar::ToolbarItemView;
+pub use toolbar::{ToolbarItemLocation, ToolbarItemView};
 use util::ResultExt;
 
 type ProjectItemBuilders = HashMap<